186 CATALOGUE OF THE MOLLUSCA 
Faminty. Cycnapipa, Fleming. 
103. CYCLAS, Bruguiére. 
1. C. cornna, Linn. 
Cyclas cornea, Gray, Turt. Man. 280, t. 1, f. 2. 
In ditches and ponds, common. 
2. C. catyouLata, Drap. 
Cyclas lacustris, Gray, Turt. Man. 281, t. 1, £ 3. 
Cyclas calyculata and lacustris, Ald. in Newe. Nat. Hist. 
Trans. i. 40, 41. 
In ponds, not common. Carr’s Hill, Newcastle Town Moor, 
Tynemouth, &c. This may possibly be the Vellina lacustris of 
Miller, but as continental authors consider it distinct, we have 
adopted Draparnaud’s name. 
104, PISIDIUM, Pfeiffer. 
1. P. optusatz, Pfeiffer. 
Pisidium obtusale, Gray, Turt. Man. 282, t. 12, f. 149. 
In a pond near Darlington.—M/r. W. Backhouse. 
2. P. pusmutum, Trt. 
Pisidium pusillum, Gray, Turt. Man. 283, t. 1, f. 7. 
In ditches and ponds, frequent. 
3. P. nrvipum, Jenyns. 
Pisidium nitidum, Gray, Turt. Man. 283, t. 12, f. 150. 
In ponds at Prestwick Car.—d. H. Near Darlington.—/r. 
W. Backhouse. 
4. P. pULCHELLUM, Jenyns. 
Pisidium pulchellum, Gray, Turt. Man. 284, t. 12, f. 152. 
In ponds and ditches, not uncommon. Var. d Jen. is found 
in ponds on Ryton Haughs. 
5. P. cinereum, Alder. 
Pisidium cinereum, Ald. in Newe. Nat. Hist. Trans. 11., 341 ; 
Gray, Turt. Man. 286, t. 12, f 152. 
Plentiful in a pond at the bottom of Castle Eden Dean. A 
more ventricose yariety is found in ditches near Brandling Place, 
Newcastle. 
6. P. amnicum, Mull. 
Pisidium amnicum, Gray, Turt. Man. 285, t. 1, f. 5. 
